CN104736928B - Optical cover for a light emitting module - Google Patents
Optical cover for a light emitting module Download PDFInfo
- Publication number
- CN104736928B CN104736928B CN201380055320.0A CN201380055320A CN104736928B CN 104736928 B CN104736928 B CN 104736928B CN 201380055320 A CN201380055320 A CN 201380055320A CN 104736928 B CN104736928 B CN 104736928B
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- China
- Prior art keywords
- light
- light shield
- emitting module
- light emitting
- bowl
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- 230000003287 optical effect Effects 0.000 title abstract description 16
- 239000007787 solid Substances 0.000 claims description 23
- 238000009411 base construction Methods 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 6
- 238000009826 distribution Methods 0.000 abstract description 15
- 241000219739 Lens Species 0.000 description 29
- 210000000695 crystalline len Anatomy 0.000 description 29
- 238000005286 illumination Methods 0.000 description 8
- 230000008859 change Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
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- 238000010586 diagram Methods 0.000 description 3
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- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
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- 238000001746 injection moulding Methods 0.000 description 1
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V5/00—Refractors for light sources
- F21V5/002—Refractors for light sources using microoptical elements for redirecting or diffusing light
- F21V5/004—Refractors for light sources using microoptical elements for redirecting or diffusing light using microlenses
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
- F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S4/00—Lighting devices or systems using a string or strip of light sources
- F21S4/20—Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V3/00—Globes; Bowls; Cover glasses
- F21V3/02—Globes; Bowls; Cover glasses characterised by the shape
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V3/00—Globes; Bowls; Cover glasses
- F21V3/04—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings
- F21V3/049—Patterns or structured surfaces for diffusing light, e.g. frosted surfaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V5/00—Refractors for light sources
- F21V5/002—Refractors for light sources using microoptical elements for redirecting or diffusing light
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V5/00—Refractors for light sources
- F21V5/04—Refractors for light sources of lens shape
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
- G02B19/0009—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed having refractive surfaces only
- G02B19/0014—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed having refractive surfaces only at least one surface having optical power
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
- G02B19/0047—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source
- G02B19/0061—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a LED
- G02B19/0066—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a LED in the form of an LED array
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S8/00—Lighting devices intended for fixed installation
- F21S8/08—Lighting devices intended for fixed installation with a standard
- F21S8/085—Lighting devices intended for fixed installation with a standard of high-built type, e.g. street light
- F21S8/086—Lighting devices intended for fixed installation with a standard of high-built type, e.g. street light with lighting device attached sideways of the standard, e.g. for roads and highways
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
- F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
- F21W2131/10—Outdoor lighting
- F21W2131/103—Outdoor lighting of streets or roads
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2101/00—Point-like light sources
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
Abstract
The present invention relates to a bowl-shaped optical cover (110) for a light-emitting module. The optical cover (110) has an inner concave surface (112) for facing a light source, and an outer convex surface (114) for facing away from a light source. The optical cover (110) comprising: a micro lenses array structure (122) arranged on the inner surface (112) of the optical cover (110) for refracting light emitted from a light source; and a macro lens structure (124) formed between the micro lenses array structure (122) and the outer convex surface (114) of the optical cover (110). The macro lens structure(124) has a thickness (Z1), wherein the thickness (Z1) is varied along the optical cover (110) such that light is refracted from a thinner part towards a thicker part of the macro lens structure (124). Various embodiments of the present invention provide improved luminous intensity distribution and luminance uniformity.
Description
Technical field
The present invention relates to a kind of bowl-type light shield for light emitting module.Additionally, the present invention relates to a kind of have bowl-type light shield
Light emitting module.
Background technology
The solid state light emitter of such as light emitting diode (LED) is increasingly used as the illumination of various illuminations and signal application
Equipment.A kind of luminaire suitable for outdoor application is high flux light emitting module.Some at least for such as roadway illumination
For outdoor application, the light for expecting conveying uniform exports and meets the requirement of optical profile.Additionally, LED module out of doors
In the case of reflector use, light-emitting area should be little as far as possible.Generally, it means that LED is relatively close to each other to be carried out
Positioning.However, conditions above does not guarantee that the uniformity and the requirement of light distribution are satisfied automatically.These requirements are for road
Particular importance for illumination, this is because less uniform light distribution may form dark hot spot on road, this for
Driver and pedestrian can be unfavorable.Additionally, less uniform light distribution possibility further requirement use is more multiple at light source
Miscellaneous optical system come meet about road the uniformity and light be distributed suggestion.
Some trials have had been made to meet the requirement of optical profile and the uniformity.For example, WO2012/040414 is disclosed
A kind of housing integrates lens to eliminate or alleviate color and brightness artifact from optical system.The system is micro- including two groups
Mirror；One of them be located at the inner surface of main optical element and second group of lenticule then positioned at the outer surface of the optical element.Especially
Ground, the lenticule on inner surface is operably coupled to lenticule corresponding on outer surface.Additionally, the light of all chips all by
The lenticule is mixed to obtain single light source.
Although activity at the scene, there is still a need for a kind of requirement for meeting the uniformity and light distribution improves to some extent
LED module.Especially, expect constitute the LED module component size and number between keep balance and cause consider
Cost is minimized in the case of manufacturing to LED module.
US7441927B1 discloses a kind of PAR lamp with single electric light source (such as LED) and lens, the lens tool
There is the lenticule being arranged in spiral pattern in the interior surface of lens.EP1500866A2 discloses one kind with height dome
Lens forming PAR lamp.The inner or outer surface of the dome lens can include lenticule or other refractive optics features.
EP0598546A1 discloses a kind of meniscus lens, and it has smooth outer surface and on an internal surface multiple hexagonal
With the lenticule of spherical curved surface.EP1524468A1 discloses a kind of luminaire with reflector, the reflector have with
The opening of diaphragm seals, the inner surface of the barrier film is covered completely by lenticule.
The content of the invention
In view of above mentioned in prior art and other defects, the overall goal of the present invention is to provide one kind to be used for
The bowl-type light shield of the light emitting module for improving to some extent.
According to the first aspect of the invention, there is provided a kind of bowl-type light shield for light emitting module.The bowl-type light shield has
For towards the concave surface of light source, and for away from the convex surface of light source.The bowl-type light shield includes lenticule battle array
Array structure, it is deployed on the inner surface of the light shield for so that the light from light source transmitting is reflected.Additionally, the bowl-type
Light shield includes the grand lens arrangement being formed between the microlens array structure and the convex surface of the light shield.The grand lens arrangement
With thickness Z1, wherein thickness Z1It is varied from along the light shield and causes light from the relatively thin part court of the microlens structure
Reflected to thicker part.
Term " lenticule " refers to micro objective, and it generally has than several millimeters less diameter, and often 10 micro-
Rice is so little.Such lens are known in the sector, and are generally transmitted with certain using convex-concave surface
The light of wavelength.Lenticule can be provided in an array manner, and can be arranged with one-dimensional or two-dimensional array.At this
In bright context, lenticule is deployed on the concave surface of the light shield by proper method.For example, with lenticule battle array
The light shield of array structure can be made by injection molding, and wherein the microlens structure is formed in a mold (reversing).
Term " grand lens " refers to any other lens bigger than lenticule, and is most often corresponding to whole cover body
Lens.Grand lens can be represented as " routine " lens, and with the size of usual 10-100mm magnitudes.One kind is for grand
The suitable material of lens is glass.It is also contemplated that be, it is possible to use the other materials of such as transparent plastic etc.With this side
Formula, the present invention proposes a kind of so that luminous intensity is distributed the light shield for making moderate progress.Additionally, the present invention is considered as such as solid
The uniformity of illuminance of the light source of state light source, the array of such as LED etc has positive influences.
One group of lenticule is used on the inner surface of main optical element and in the appearance of the main optical element with available
Compared using one group of lenticular prior art systems on face, the invention provides a kind of less complex technical solution,
It only has the microlens array being deployed on the concave surface of light shield.For this purpose, by the principle of the present invention, it is not only possible to improve
Luminescence Uniformity, and the distribution of luminous intensity may be improved.It thus provides a kind of two kinds of work(of combination for light emitting module
The bowl-type light shield of energy.
Because the thickness of grand lens arrangement is varied from along the light shield light is caused from the relatively thin portion of the grand lens arrangement
Divide towards thicker part and reflected, so the light from solid state light emitter carries out diffraction towards the thicker part of the light shield.
So, compared with available prior art, luminous intensity distribution is further improved.
Further, since present invention improves luminous intensity distribution, it is possible that preferably tackling various technical specifications.This
Sample, by light shield of the invention, using the teaching of the invention it is possible to provide a kind of LED module mutually compatible with different types of light fixture, while still
The overall performance for guaranteeing the light fixture is maintained.Therefore, it is also an object of the present invention to provide a kind of be more flexibly used for
The light shield of light emitting module.
Thus, the present invention increased selection quantity for appropriate LED, and therefore extend such as providing electric screen
The design freedom of the extention of the protective cover for covering etc.
As the above mentioned, because technique effect has been lifted, more small-sized luminous mould may be utilized in light fixture
The quantity of LED in block and reduction light emitting module, while keeping the high uniformity.Therefore, by the present invention, there is provided one kind system
Make relatively inexpensive light emitting module.
Uniformity of illuminance is considered as the important quality for solving the problems, such as how to be uniformly distributed in a region light.Illumination
The uniformity should in the open air for being such as used for road, street, parking facility, park, natural geomorphology, footpath and cycle track etc
It is particular importance with.In other words, the change of the height and the section of low illumination that are contrasted may be such that eyes
Feel serious discomfort, produce pressure and feeling of fatigue and therefore jeopardize road safety.What is be not limited by any theory
In the case of, it is appreciated that it is caused suddenly without half-light speckle institute that the uniform light degree for making moderate progress can allow people persistently to perceive environment
Interrupt.In addition, less uniform Illumination Distribution needs increasingly complex optical system to realize uniform light on road at light source
Line is distributed.By this way, uniformity of illuminance contributes to shifting to an earlier date anticipation when driving so that traffic flow is more smoothly and makes
Obtain driver more to loosen.Therefore, it was briefly mentioned as before, another target again of the present invention is to provide a kind of so that shining
The bowl-type light shield for light emitting module that the degree uniformity makes moderate progress.
In various embodiments, the light shield can be formed by base part and tip portion.Herein, in base portion
In point, thickness Z1It is less than in tip portion.
Preferably, the microlens array structure can include surface micro lens.It is micro- with curve form by providing
Mirror, the uniformity further makes moderate progress.Why this is achieved in that the lenticule has by this is lenticular
Reflected on surface and mixed the function of light.The curve form for example can be sphere, ellipse or can provide required
A part for any other curve form of light refraction.
As the above mentioned, for each embodiment, when microlens array structure includes multiple lenticulees, each is micro-
Lens can be being disposed away from any other lenticular central point apart from P.Thus, it is being formed in two contiguous microlens
Intersecting part incisal plane T and convex surface between form angle [alpha].Therefore, the angle is corresponding to the incisal plane and evagination table
Deviation between face.
Generally, due to the distance between LED differences, light emitting module light X different with transverse direction Y needs along the longitudinal direction
Line mixing is required.
In order to meet the requirement, the light mixing must carry out independent regulation in two dimensions.Therefore, in each embodiment
In, the central point between two lenticulees in the longitudinal direction X of the light shield is apart from P1With in the transverse direction Y of the light shield
Two lenticulees between central point apart from P2It is different.In this manner, it may be possible to by the mixing in X-direction and Y-direction
Amount is separated further to improve the uniformity.So, the light mixing in two dimensions can be independently adjustable.
According to the second aspect of the invention, there is provided a kind of light emitting module, it is included according to as the above mentioned arbitrarily
The bowl-type light shield of aspect.The light emitting module further includes multiple solid state light emitters, and it is configured to the indent table towards the light shield
Face lights.
Solid state light emitter is wherein to produce the light source of light by the restructuring in electronics and hole.The example of solid state light emitter includes
Light emitting diode (LED) and semiconductor laser.Solid state light emitter can advantageously be engaged to the surface of pedestal result.At one
In embodiment, LED is arranged to four rows, and where each row includes 10 LED.However, such as those skilled in the art institute obviously
, the light emitting module can have the LED of varying number, the different deployment forms of the LED or LED of different line numbers.
The present invention can be implemented in various light fixtures.The light fixture can have further feature, such as guide the reflection of light
Device, for the external shell that is aligned and protects or shell, and ballast or power supply.According to the characteristic of the light fixture and specific
Lighting demand, the light fixture can be installed in the appropriate support member of such as lamp stand.
It is noted that the present invention relates in claim cited feature be possible to combination.
Description of the drawings
This aspect of the invention and other side are carried out referring now to the accompanying drawing for illustrating (multiple) embodiment of the invention
More detailed description.
Fig. 1 to be deployed in light emitting module in light shield in the form of diagrammatically illustrate bowl according to each embodiment of the invention
The exemplary application of type light shield, the light emitting module includes multiple solid state light emitters；
Fig. 2 a are the perspective schematic views of the bowl-type light shield of Fig. 1；
Fig. 2 b show the cutting drawing of a part for the bowl-type light shield of Fig. 2；
Fig. 3 a show the view of two contiguous microlens of bowl-type light shield, including radius R, central point apart from P, cut
Plane T and angle [alpha]；
Fig. 3 b show the microlens array structure of the bowl-type light shield extended in longitudinal direction X and transverse direction Y
View；
Fig. 3 c show another view of two contiguous microlens of bowl-type light shield；
Fig. 3 d show another view again of two contiguous microlens of bowl-type light shield；
Fig. 4 shows the cutting drawing of the diffraction for the part that several light beams pass through bowl-type light shield so as to the impact to grand lens
Illustrate；
Fig. 5 shows the figure of the relative luminous intensity of the light emitting module including bowl-type light shield of the invention.
As shown in FIG., the size in component and region is amplified for purposes of illustration and and therefore is provided to figure
The population structure of the embodiment of the present invention is shown.Same reference refers to all the time same key element.
Specific embodiment
Now the present invention is described more fully hereinafter below with reference to accompanying drawing, is worked as shown in the drawings of the present invention
Front preferred embodiment.However, the present invention can in many different forms embody and should not be construed as limited to this
In given embodiment；Conversely, these embodiments are provided for comprehensive and integrity, and to people in the art
Member fully transmits the scope of the present invention.
In the following description, present invention is described for the light emitting module of Primary Reference including multiple solid state light emitters.However,
It should be noted that this is not intended to limit the scope of the present invention, the present invention is for example equally applicable to be had respectively
Plant the light emitting module of light source and the other configurations of solid state light emitter.
Fig. 1 to be deployed in the light emitting module in the lamp stand 104 of road in the form of schematically illustrate it is of the invention
The exemplary application of the embodiment of bowl-type light shield that will be used in light emitting module.The light emitting module is intended to also replacing as daylight
Change thing and therefore uniform white light should be sent.In light emitting module 100, there is provided according to one embodiment of present invention
Bowl-type light shield 110.Light emitting module 100 is preferably attached protective housing or shell 140 is covered to protect bowl-type light shield
110 and light emitting module 100 avoid damaging and/or affected by extreme weather.Protective housing or shell 140 are preferably by transparent
Material is made and can be by made by any suitable material of such as glass or plastics.
With reference to Fig. 2 a, it is the schematic diagram of the light emitting module 100 in Fig. 1 and bowl-type light shield 110, light emitting module here
100 include being configured to engage the base construction 150 of lamp stand, which ensure that light emitting module 100 by solidly joined so as to keep away
Exempt from any failure of light emitting module 100.So, base construction 150 is that light emitting module 100 provides necessary stability.Pedestal
Therefore structure 150 can include the installing device for being arranged on light emitting module 100 on lamp stand.For example, as shown in Fig. 2 bag
Including the base construction 150 of light emitting module 100 can be installed to lamp stand 104 using screw or bolt, and therefore can be carried
It is provided with engaging hole.
It should be noted that Fig. 2 a are the simplified illustrations of the light emitting module 100 in Fig. 1, and such as it is directed to light emitting module
Electrical connection and the various structures for installing the structure etc of light emitting module be not explicitly indicated.However, such
Structure can be provided with many different modes apparent to those skilled in the art.
Additionally, light emitting module 100 includes multiple solid state light emitters 120.Solid state light emitter 120 can be deployed in base construction 150
Advantageously can be arranged above and with two-dimensional array.In one embodiment, the solid state light emitter is provided in the form of LED.
Diffusing panel (or remote phosphor film) can be deployed in before the solid state light emitter to enter the light that the light emitting module is launched
Row diffusion.Additionally or alternatively, the solid state light emitter can be deployed on printed circuit board (PCB) (PCB), and the latter is typically base
The integration section of holder structure 150.In another embodiment, the PCB is the unitary part of the light emitting module, and it passes through arbitrarily suitable
When means are engaged to base construction, such as by binding agent.
Light emitting module 100 and bowl-type light shield 110 are made a more detailed description referring now to Fig. 2 a and 2b.Such as Fig. 2 a
In schematically indicate, light emitting module 100 includes bowl-type light shield 110.Bowl-type light shield 110 is engaged to base construction 150, so as to
Closing solid state light emitter 120.Bowl-type light shield 110 has the concave surface 112 being used for towards light source, and for away from light source
The convex surface 114 of side, above-mentioned light source is solid state light emitter 120.As shown in Fig. 2 the shape constitutes hemicycle, Fig. 2 is this
Light covers on the sectional view of the shape of longitudinal direction X and thickness direction Z.In other words, the shape of the light shield has in longitudinal direction X
Extension, transverse direction Y in extension and the extension in thickness direction Z, and cause the light shield outer surface formed protrusion table
Face.For example, the extension in longitudinal direction X is between 50 to the 80mm, the extension in transverse direction Y in 15-30mm it
Between, and the extension in thickness direction Z is between 5-25mm.To be noted, the net shape of the light shield should be fitted
For the deployment form and/or the shape of light emitting module 100 of its solid state light emitter 120 placed on it.Preferably, the light shield is by list
Layer material is formed.It is also contemplated that, if the light shield can be made up of the identical material of dried layer.
In all embodiments of the invention, bowl-type light shield 110 includes being deployed on the inner surface 112 of the light shield 110
Microlens array structure 122, to reflect to the light sent from light source.In various embodiments, the microlens array
Structure includes multiple lenticulees.If seen from the embodiment shown in Fig. 2 a and 2b, and as explained above, should
Microlens array structure includes here spherical microlens.Include the lenticular light shield 110 with spherical shape by providing,
The uniformity makes moderate progress.Why this realizes that be because that lenticule has is mixed by being reflected on lenticular inner surface
The function of closing light line.
Herein, amount of refraction is determined by each lenticular maximum angle α.With reference to Fig. 3 a-3d, the angle [alpha] is by every
The radius R of individual spherical lenss and the central point of each lens are determined apart from P.Therefore, herein, radius R is referred to as micro-
The radius of curvature of lens surface.That is, each lenticular surface is a part for sphere, as shown in such as Fig. 2 b, its
In the sphere there is radius R.Therefore, each lenticule is here sphere and is defined by radius R.Although it is right to refer to
For the radius R of lens, but be also to it is foreseen that, the lenticule can be by any other suitable parameter institute for describing its curvature
Definition.Generally, lenticular radius R and size determine lenticular intensity.In this respect, those skilled in the art show and
It is clear to, the scope of radius R is determined by selected lenticular size and required effect.
In certain embodiments, as shown in Figure 3 a, the length of each lenticular radius R is constant, the i.e. length of radius
Degree is all identical for all lenticulees.However, in other embodiments, the length of the first lenticular radius R can be with
The length of the second lenticular radius R is different.It is every in the microlens array structure 122 in still another embodiment
Individual lenticular radius R is less than 10mm.In a specific embodiment, the length of radius R is 2.6mm.Although cannot from figure
Find out, but can also be readily appreciated that, for given central point apart from P, due to lenticular geometry, little radius
R corresponds to big angle [alpha].Accordingly, big radius R corresponds to little angle [alpha].
Angle [alpha] refers to the angle being formed between the incisal plane T of the intersecting part of two contiguous microlens and convex surface 114
Degree.If seen from Fig. 3 b, little central point corresponds to little angle [alpha] apart from P.If seen from Fig. 3 c,
Big central point corresponds to big angle [alpha] apart from P.Therefore, angle [alpha] is corresponding to inclined between incisal plane T and convex surface 114
Difference.The specific joining to be noted, between incisal plane T and convex surface 114, convex surface 114 is by as flat
Smooth surface.
According to one embodiment of present invention, as shown in Figure 3 d, as in the longitudinal direction X of bowl-type light shield 110
The central point of the distance between two lenticulees is apart from P1With two lenticulees in the transverse direction Y as bowl-type light shield 110
The distance between central point apart from P2It is different.In this manner, it may be possible to the combined amount in X-direction and Y-direction is carried out
Separate further to improve the uniformity.For example, central point is apart from P1Between 3 to 10mm, and central point is apart from P2In 3
To between 15mm.To be noted, Fig. 3 d depict simplified diagram of the central point between two lenticulees apart from P.Therefore,
In practice, lenticule is generally substantially even more closely disposed mutually in X-direction and Y-direction, and Jing is often with such as Fig. 2 b
Shown pattern is disposed.
It is not limited by any theory, in shade angle, light-emitting area becomes less and therefore needs less mixed
Close.So, central point changes along reticle surface apart from P with lenticular Angle Position.
Fig. 2 a and 2b are referred again to, bowl-type light shield 110 further includes to be formed at microlens array structure 122 and bowl-type light
Grand lens (macrolens) structure 124 between the convex surface 114 of cover 110.It is grand as shown in Fig. 2 b more clearly
Lens arrangement 124 has thickness Z1.Thickness Z1Change along light shield 110 and cause light from the relatively thin part of grand lens arrangement 124
Reflected to thicker part.That is, the thickness is from thickness Z1It is changed into Z2.Herein and as shown in Figure 2 b, thickness
Z1Change along angle γ.Can also understand from Fig. 2 b, angle γ is defined as the surface comprising solid state light emitter 120,
Angle i.e. between the surface normal on the surface of base construction 150.The scope of angle γ is from 0 ° to ± 90 °.Therefore, 0 ° is vertical
In base construction 150, and 90 ° then parallel to base construction 150.In one embodiment, thickness Z1In the pedestal in light shield 110
It is less than in the tip portion 134 of light shield 110 in part 132.This has been illustrated in figure 2b, i.e. the base part of light shield 110
The 132 thickness Z with the tip portion 134 less than light shield 1102Thickness Z1.The technique effect of microlens structure 124 is also in Fig. 4
In illustrated, it illustrates how light is reflected towards the thicker part of light shield 110.So, from solid state light emitter
Light is reflected towards the thicker part of light shield 110.Accordingly, it is possible to further improve the distribution of luminous intensity.In other realities
In applying example, thickness Z1Change along angle γ.With regard to Fig. 4, it is noted that, light beam has amplified in the refraction of inner surface.
Additionally, in practice, refraction is also had in outer surface.
Thus, the thickness change of grand lens 124 mainly has influence on the distribution of luminous intensity, and microlens array 122
Then mainly affect uniformity of illuminance.It is to be noted, due to the invention provides two kinds of functions, so and can not possibly completely by
Above mentioned two kinds of technique effects are isolated.
As the above mentioned, the uniformity is all substantially made moderate progress by bowl-type light shield 110 in all solid state light emitters.
And, being deployed in several LED of base construction perimeter can be likely more due to light shield closer to the perimeter
Readily it is resolved, this is because the light shield is bowl-type.That is, due to the curvature of the light shield, and in the light shield
Distance at the point Q of pedestal is compared, and the distance between the light shield and the LED that is deployed on base construction are in the light shield top
It is less at partial point S.
With reference to Fig. 5, the relative luminous intensity of the light emitting module 100 including bowl-type light shield 110 is shown.Herein, art
Language " relative " refers to the luminous intensity of the greatest measure relative to the luminous distribution of lambert (Lambertian).In the figure, for
Light emitting module including light shield and the light emitting module without any light shield depict relative luminous intensity.Considering
The two examples are depicted in the case of the luminous distributions of Lambertian.The angle refers to angle γ as shown in Figure 2 b.No
The relative luminous intensity of the light emitting module of light shield is shown by dashed lines, including the relative luminous intensity of the light emitting module of light shield is by white line
Illustrate, and Lambertian relative luminous intensities are by shown by continuous lines.Lambertian is luminous to be distributed in 0 ° with most
Big luminous intensity, it drops to 0 at -90 ° and+90 °.For all examples, relative luminous intensity shows big distribution, wherein
There is peak value relative luminous intensity in 0 ° of angle, and there is minimum luminous intensity at -90 ° and 90 °.Such as the flow chart in Fig. 5
It is shown, when light emitting module is when without using in the case of light shield, first area-i.e. 0 ° -41.4 °-in there is excessive number
Light, and the 4th region-i.e. 75.5 ° -90 °-in amount of light it is then not enough.However, including bowl when using
During the light emitting module of type light shield, measured luminous intensity all makes moderate progress for all regions, and obtain closer to
The luminous intensity distribution being more uniformly distributed of Lambertian relative luminous intensities.Especially, by the invention it is realised that all
In region, relative luminous intensity is all within the 4% of Lambertian relative luminous intensities.Above mentioned diagram is to use
It is in exemplary purpose and to be noted, some changes there may be according to the net shape and thickness of bowl-type light shield.
It is noted that by providing the light emitting module with bowl-type light shield, gap is not produced to subtract by removing random LED
Few LED quantity is possibly unpractical.In practice, remove in LED base structure corner location LED or by its across
Surface redistributes.However, by the present invention, compared with the original luminance without light shield is distributed, still may provide and change
The kind uniformity.This is because using the light shield, the illumination area increase of each LED is of about the size of the LED spacing.
Additionally, by studying accompanying drawing, open and claims, those skilled in the art are putting into practice claimed
It will be appreciated that and implementing to be directed to the change of disclosed embodiment when bright.In the claims, word " including " is not precluded from other
Key element or step, and indefinite article " one " (" a " or " an ") be not precluded from it is multiple.Some measures are in mutually different subordinate
The only fact being cited in claim not represents that the combination of these measures cannot be utilized.
Claims (7)
1. a kind of light emitting module (100), including:
Base construction (150)；
Multiple solid state light emitters (120), are bonded to the base construction (150) and are arranged to towards bowl-type light shield (110)
Concave surface (112) lights, and the light shield (110) further has for away from the evagination table of the plurality of solid state light emitter
Face (114), the light shield (110) includes：
- microlens array structure (122), it is arranged on the inner surface of the light shield (110) (112) for causing from light source
The light of transmitting is reflected and including the lenticule of curved surface；With
- be formed at it is grand between the microlens array structure (122) and the convex surface (114) of the light shield (110)
Lens arrangement (124), the grand lens arrangement (124) with thickness (Z1), wherein the thickness (Z1) is along the light shield
(110) it is varied from and so that light is reflected from the relatively thin thicker part that is partially toward of the grand lens arrangement (124)；
Wherein, the central point between two lenticulees in the longitudinal direction (X) of the light shield (110) is apart from (P1) and in institute
Central point distance (P2) stated between two lenticulees in the horizontal direction (Y) of light shield (110) is different；
Wherein described light shield (110) is formed by base part (132) and tip portion (134), and the thickness (Z1) is in the base
It is less than in the tip portion (134) in seating portion (132)；And
Wherein described bowl-type light shield (110) is elongation on the longitudinal direction (X).
2. light emitting module (110) according to claim 1, wherein the light shield (110) is formed by single material layer.
3. light emitting module (110) according to claim 1, wherein each lenticule for sphere and by radius (R) institute
Definition.
4. light emitting module (110) according to claim 3, the wherein length of each lenticular radius (R) for
All lenticulees are identicals.
5. light emitting module (110) according to claim 3 or 4, wherein each in the microlens array structure (122)
The length of the lenticular radius (R) is less than 10mm.
6. light emitting module (110) according to any one of claim 1-4, wherein the microlens array structure (122)
Including multiple lenticulees, and wherein each lenticule is arranged away from any other lenticule with central point distance (P), thus
Angle [alpha] is formed between the incisal plane (T) of the intersecting part of two contiguous microlens and the convex surface (114).
7. light emitting module (100) according to any one of claim 1-4, wherein the bowl-type light shield (110) is with edge
The extension between 15mm and 30mm of the extension between 50mm and 80mm of longitudinal direction (X), in transverse direction (Y), with
And extension of the through-thickness (Z) between 5mm and 25mm.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201261717218P | 2012-10-23 | 2012-10-23 | |
| US61/717,218 | 2012-10-23 | ||
| PCT/IB2013/059362 WO2014064576A1 (en) | 2012-10-23 | 2013-10-15 | Optical cover for a light emitting module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104736928A CN104736928A (en) | 2015-06-24 |
| CN104736928B true CN104736928B (en) | 2017-05-10 |
Family
ID=49943415
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201380055320.0A Expired - Fee Related CN104736928B (en) | 2012-10-23 | 2013-10-15 | Optical cover for a light emitting module |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20150276166A1 (en) |
| EP (1) | EP2912368B1 (en) |
| CN (1) | CN104736928B (en) |
| WO (1) | WO2014064576A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USD830005S1 (en) * | 2011-05-13 | 2018-10-02 | Classic Brands, LLC | Reversible insert for a bird feeder |
| TWI585334B (en) * | 2015-06-17 | 2017-06-01 | 國立中央大學 | Lamp structure of adaptive streetlight |
| US10451226B2 (en) | 2015-09-14 | 2019-10-22 | ProPhotonix Limited | Modular LED line light |
| JP6900639B2 (en) * | 2016-08-03 | 2021-07-07 | ウシオ電機株式会社 | Light source unit |
| US10845013B2 (en) | 2018-10-03 | 2020-11-24 | Vista Manufacturing Inc | Flexible light assembly |
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- 2013-10-15 EP EP13818796.8A patent/EP2912368B1/en not_active Not-in-force
- 2013-10-15 CN CN201380055320.0A patent/CN104736928B/en not_active Expired - Fee Related
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Also Published As
| Publication number | Publication date |
|---|---|
| EP2912368A1 (en) | 2015-09-02 |
| EP2912368B1 (en) | 2017-12-13 |
| CN104736928A (en) | 2015-06-24 |
| US20150276166A1 (en) | 2015-10-01 |
| WO2014064576A1 (en) | 2014-05-01 |
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